304 



PATHOLOGY OF NUTRITION. 



the result of the pressure exerted by the rapid cell-prolifera- 

 tion and the lack of space, the flat cells are found on edge 

 and concentrically arranged in whorls, which often have a 

 glistening appearance as the result of a horny transformation 

 or cornification constituting the so-called " pearly bodies" 

 (Fig. 133). 



Epitheliomata appear as elevated nodular masses or diffuse 

 infiltrations of rather slow growth, very prone to ulceration 



FIG. 133. 



Epithelial pearl-body from an epithelioma of the lip. a, pearl-body ; b, surrounding 

 epithelium, forming one of the epitheliomatous tongues or co'lumns ; c, round- 

 celled infiltration of the contiguous fibrous tissue (Dunham). 



and great destruction of tissue. Metastasis may occur, but is 

 not common. The term colloid cancer is applied to any of 

 the above forms which has undergone a colloid degeneration. 



Myoma. 



A myoma is a tumor composed of muscle-tissue. There are 

 two varieties, corresponding to the two varieties of muscle- 

 tissue rhabdomyoma, formed of striped, and leiomyoma, of 

 unstriped muscle-tissue. 



Rhabdomyomata are exceedingly rare. In a few instances 



